Whereas PM focuses on isolating bits of data within the storage medium so they don't interfere with each other, MOH relies on making those bits small enough for that to become impossible.

Of course, not all is wine and roses - Sony says it can only write data to MOH disks at the minute, but can't actually read them. Moreover, the Tokyo firm is still flying solo on the research front, although it's sure to be scouring the classifieds soon for a hard-drive maker keen on a meaningful relationship.